system
6
Hello,
it happens with all versions (i could find/hear of 6,8,9, i didn’t update to 10 yet)
it happens with all .pdf plain unsigned
it happens on launching the reader alone without a file to open
i am waiting for an answer from s.o. who DOESN’T have the problem (under Vista 
[EDIT] it doesn’t happen with 10.0.0 under Vista
i have attached drwts32_avast_reader.log
(oldest leanest version i have xp sp2 6.0.1)
i hope it helps.
i wish you good luck, many thx for this product!
cb